Loom picking motion



A. MULLER LOOM PICKING MOTION Jan. 22, 1952 2 SHEETSSl-IEET 1 Filed Feb. 25, 1948 Jan. 22, 1952 A. MULLER LOOM PICKING MOTION 2 SHEETS--HEET 2 Filed Feb. 25, 1948 Patented Jan. 22, 1952 TED STATES @PATEJN'T orries LO'O'M PICKENG MOTION iilbe'rt Miiller, Uster, Switzerland, assignor to Albert Miiller, Jan, Glattbr-ugg, Switzerland Application February 25, 1943, stiriaflflolflliiwl In Switzerland August 31, 1 946 Section ;1, Public Law 890, dugustjg lil iil Patent expires August 31,;1966

(Cl. 13M473 3 Claims. 1

The present invention refers to picking rno trons on looms.

The picking motions on looms of heretofore known types differ little from each other in their mode of operation. These motions are brought about in a shock causing and noisy manner and heavy wear and tear on the loom parts ensue. Generally the picker stick of the loom is actuated by an angular, elastic or bent traction device.

The picking process, therefore, inwhich the picker stick is driven right from the beginning of its movement by picking elements which have already reached a definite speed, results in the components of the picking motion being subjected to enormous stresses at the beginning of the pick, a steep increase in the force applied ensuing immediately afterwards.

A main object of the invention is to provide means eliminating this drawback and improving the operation of picking elements.

The picking motion in accordance with the invention, operating on the principle of resolving the impact force into compound forces, is characterized by a picker stick traction element of elbow-lever type moving as a complete unit together with the slay, arranged in its extended, initial position parallel with the shuttle race of the slay and under the action of a picker arm governed for uniform movement by a cam-disk connection on the loom, operating in such fashion that the impact force applied is always gradually increased from zero, the pivotal attachment of the traction element moving at increasing speed throughout the duration of the pick.

The drawing shows a typical embodiment of the picking motion in accordance with the invention.

Figs. 1 and 2 illustrate diagrammatically in elevation the picker stick at the left and right end of a loom, respectively.

Fig. 3 shows in the form of a diagram the movement of the picker stick traction element and the time-curve of the movement of its pivotal attachment along with the picker stick.

Figs. 4 and 5 are respective top plan views of Figs. 1 and 2.

Figs. 6 and 7 show on an enlarged scale the traction element with its ball joint in elevation and in top plan, respectively.

Fig. 8 shows another embodiment of the traction element, in its extended position and in elevation.

Fig. 9 shows a further detail of the picker stick pivot of Figs. 1 and 2, seen in the position occupied before the pick.

Fig. 10 iis a wifewfsimflar tothat of Fig.= 9, but withthepicker istickpivots of Figs. 1 and 2- in' posifiionn on completion fof the picking movement.

From Figs. 1, 2, 4 and 5 it will be seen that the elbow-lever type traction element e--J so jointed as to permit motion in up and down directions, is extended in horizontal direction, 1. e. is parallel to the shuttle race, in its initial position (Fig. 1) and is flexed each time under the action of a picker arm d governed by a cam-disk connection w-b of the loom through a disk or cam follower 12 and a picking shaft 0. During this picking movement the pivoting attachment point P of the push-rod f moves along with the picker stick g (as shown diagrammatically in Fig. 3) at a constantly increasing speed from the point 0 to the point 6 this being achieved by a uniform motion of the crank e. As the picker arm d, at the beginning of the picking movement, pushes the picker stick traction element ef perpendicularly to the longitudinal direction of said picker stick traction element, the force of impact applied and transmitted to point P is gradually increased from zero.

Figs. 4 and 5 show clearly that the picker stick traction element e-f moves as a complete unit together with the slay, as the crank e is pivotally attached to the slay support S which, firmly bolted to the rocking shaft I of the loom, performs with a reciprocal motion. 1

Figs. 6 and 7 show another embodiment of the picker stick traction element e-f with ball joints. This traction element operates without any loss of picking force, this result being achieved by the flexing or elastically operating traction joint. Said figures also show the manner in which the picker arm d drives the crank e, and the manner in which the push-rod f is mounted on the picker stick g.

In order to reduce the wear on the flexing joint of the picker stick traction element ef, the crank e and the push-rod f are, as seen in Fig. 8, connected by a belt coupling or strap r instead of by a pivoting joint. The picker arm at firmly bolted to the picker shaft 0 engages the belt coupling r from below, thus causing the traction element e--f to flex, as shown in Fig. 8.

In the details shown in Figs. 9 and 10, the picker stick segment it rolls during the picking movement along bands i stretched out on the picker stick socket or support k, which is mounted on the rocking shaft I. As a'result, the picker stick 9 drops the distance indicated by arrows a: during the picking process from the position shown in Fig. 9 to that shown in Fig. 10. In consequence, the pivotal attachment point P and the picker end of the picker stick y do not move upwards in an arc, but follow at least an approximately horizontal path parallel to the shuttle race.

Having thus described the invention, what is claimed as new and desired to be secured by Letters Patent, is:

1. In a picking device for a loom having a slay with shuttle race; comprising a picker stick, an elbow-lever type traction element pivoted on the picker stick and arranged to move as a unit together with said slay, said traction element being arranged in its extended and initial position substantially parallel to said shuttle race of said slay, a picker arm, and a cam-disc connection for said arm for uniformly moving the same on said loom and for operating said arm in such fashion that the force of impact applied and transmitted to the pivot of said traction element is gradually increased from zero, whereby the latter is moved during picking operation at increasing speed.

2. In a picking device according to claim 1,

wherein said elbow-lever type traction element is collapsible and arranged to move in an upward direction relative to said slay.

3. In a picking device according to claim 1, wherein during the picking operation the picker stick is displaced upwardly to said traction element together with the pivot, a support, bands connecting said picker stick with said support, and a rocker shaft carrying said support, whereby the pivot at the picker stick is prevented from moving in an arc and is forced to move substantially in horizontal direction and parallel to said shuttle race.

ALBERT MULLER.

REFERENCES CITED UNITED STATES PATENTS Name Date Moessinger May 30, 1939 Number 2,160,339 

